Articulated boom, machine, method for manufacturing a connecting piece for an articulated boom and use of an articulated boom

Abstract

A machine, in particular a forest harvester, includes a superstructure, an undercarriage, and an articulated boom. The boom is pivotably connected to the superstructure and comprises a first limb, which is pivotably connected to the superstructure, and a second limb, which is pivotably borne at the first limb. The first limb has a first section (which is connected to the second limb), a second section (which is connected to the superstructure), and an electrically insulating connecting piece which connects the first section to the second section and which is rigidly connected to the first section and to the second section. The connecting piece including glass fibers which are cast with a plastic matrix, wherein a lifting and stick cylinder is disposed between the second limb and the first section of the first limb, so that the second limb is electrically isolated from the superstructure of the machine.

We claim: 
     
         1 . A machine, in particular a forest harvester, comprising a superstructure, an undercarriage and an articulated boom, which is pivotably connected to the superstructure and which comprises a first limb, which is pivotably connected to the superstructure, and a second limb, which is pivotably borne at the first limb, wherein the first limb comprises a first section, which is connected to the second limb, a second section, which is connected to the superstructure, and an electrically insulating connecting piece which connects the first section to the second section and which is rigidly connected to the first section and to the second section, said connecting piece comprising glass fibers which are cast with a plastic matrix, wherein a lifting and stick cylinder is disposed between the second limb and the first section of the first limb, so that the second limb is electrically isolated from the superstructure of the machine. 
     
     
         2 . The machine according to  claim 1 , wherein the connecting piece comprises a core which is wrapped by the glass fibers. 
     
     
         3 . The machine according to  claim 2 , wherein the core consists of foam glass and has a gross density in the range of 100 to 165 kg/m 3 . 
     
     
         4 . The machine according to  claim 1 , wherein the connecting piece includes a first end region and a second end region, said first end region partially being introduced into the first section and said second end region partially being introduced into the second section. 
     
     
         5 . The machine according to  claim 4 , wherein the first end region and the second end region of the connecting piece which are introduced into the first section and into the second section respectively are connected to the first section and to the second section using connecting means. 
     
     
         6 . The machine according to  claim 4 , wherein the first end region and the second end region of the connecting piece which are introduced into the first section and into the second section respectively are glued to the first section and to the second section respectively. 
     
     
         7 . The machine according to  claim 1 , wherein the connecting piece includes a first flange on a first end and a second flange on a second end, the first section including a third flange and the second section including a fourth flange, and the first flange being connected to the third flange in a force-fitting manner and the second flange being connected to the fourth flange in a force-fitting manner. 
     
     
         8 . The machine according to  claim 7 , wherein the first flange comprises first webs and the second flange comprises second webs, the first flange and the second flange each being disposed at the end of a core which is wrapped by the glass fibers, and the webs of the flanges also being wrapped by the glass fibers in addition to the core. 
     
     
         9 . The machine according to  claim 1 , wherein the plastic matrix comprises thermosetting materials, thermoplastics and/or elastomers. 
     
     
         10 . The machine according to  claim 1 , further comprising a felling head, wherein the felling head is disposed at the articulated boom.